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After downloading every possible driver and tweaking every possible adjustment I have come to this conclusion: There is NO built-in microphone on the eMachines D725! Oh, the Device Manager will show it, all right but I assure you, there is no built-in device that can pick up sound on that laptop model. You'd think that a laptop, albeit a budget on, with a built-in webcam should also have an accompanying built-in mic for messaging and calls, but it doesn't. The mic may have fallen by the wayside during the cost-cutting sessions, along with the 3rd and 4th USB ports. Your only options are to connect an external microphone or to trade the D725 for a real laptop.

it might be a bad mic or it may be your mic settingsits worth looking into, try connecting a audio source to it when you are configuring it and have the volume control for the microphone (on the playback section) so that you can hear it when it starts working

have you checked the settings under control panel/sounds and audio devices?open that up click the voice taband under voice recording press the volume button, check to see if the check box has a tick in it under microphone and that the volume is turned up. try the test hardware button to test your mic and adjust the levels from within the wizard.

Here is one way to unmute the microphone.
Go to Start/Programs/Accessories/Entertainment/Volume Control.
You will see a Volume Control window up. On the top you should see different items to set the volume for. If the microphone is one of them, uncheck the mute box. If you don't see microphone on the list do this: Click on Options on the top and then go to Properties. In the white box where it says "Show the following Volume Controls" check the box next to microphone and click ok.
Now you should have the Volume Control windows available with microphone as an option. Uncheck the mute box and that should do it. Let me know if this works for you.

There are two settings for the microphone in Windows XP. One is for the volume of the mic you hear through the speakers. The other is for the recording volume of the microphone (and the volume others here when you speak to them through Skype or another program).

First check the recording volume:Volume Manager (double click on speaker icon on your taskbar) -> Options -> Properties -> Recording -> OK -> Make sure the Microphone slider is at least halfway turned up and make sure the Microphone is selected